There are some good lux meters available in the 15 25 range but shipping always takes a long time and i needed it now. Building the lux meter is simple.
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In theory you could use any resistance value but i chose 5 kohm because the resistance of the ldr was in the order of a few kilo ohms under typical room lighting conditions.
Photodiode lux meter arduino. Ive made the following design to simulate this in proteus but since i dont own a lux meter. This is to be part of my lightcontroller project for monitoring high wattage lamps 1000w. This illumination converted to corresponding voltage using op amp circuit.
Telefunken specifies the sensitivity between 44 and 10 nalx with a typical value of 7 nalx. Building the lux meter. Photodiode is in the class of photo junction device which is basically a pn junction light sensor.
I only need an arduino an lcd shield the ldr that i just characterized and a 5 kohm resistor. This type has a relative spectral sensitivity roughly corresponding to the human eye. Ive got the microcontroller code working properly measuring values on a pin and reporting it as an led brightness but im having trouble getting the photodiode to report a voltage dependent on light levels.
Supply 9 vdc pp3 battery at 20 ma onboard photo diode onboard preset for calibration. Building the lux meter is very simple. In theory you can use any resistance value but i chose 5 kohm because the ldrs resistance was in the order of a few kilo ohms under typical room lighting conditions.
When light is incident on a photodiode the electrons and holes are separated and will allow the junction to conduct. So i grabbed an arduino a nokia 5110 lcd. To create a photodiode interface for my arduino uno board that can measure very high lux values.
They are generally made from semiconductor pn junctions and are sensitive to visible light and infrared light. Thats when i realized that i had an unused bh1750 light meter module laying around which i bought some time ago but never used it. Illumination is luminous flux falling on surface area of photo diode.
You only need an arduino an lcd shield an ldr and a 5 kohm resistor. The photodiode chosen for this lux meter is the bpw21. Im trying to use a photodiode to measure light levels via an adc on an atmega168.
Photodiode to arduino interface for high lux measurement. Simple circuit with photodiode op amp arduino and oled display. Lux meter project has been design to measure the illumination.
Building the lux meter. The bpw21 has a spectral sensitivity of 10 nalx osram but the spread is rather large.
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